These are updated versions of an official Solaris FCS release. Solaris updates are officially known by the month and year they come out (ej: Solaris 10 update 11/06). But during the development process you never quite know what month is the right one to use. So inside Sun, these are known as update 1, update 2, etc. When bugs are marked fixed, they are marked as “fixed in update N”. Es bastante útil conocer la relación entre el nombre oficial y el interno. See also: Solaris Updates Table